Calculating-machine.



H. E. GOLDBERG.

CALCULATING MACHINE. Arrnwulou FILED SEPT. 20, 1911.

Patented Sept. 29, 1914.

rims? .n

PATENT @FFICYE.

HYMAN ELI GQLDBERG, F CHICAGO, ILLINOIS, ASSIGNOR TO GOLDBERG CALCULAT- 1N5} MAGHINE CUMPANSZ, OF GHICAGO, ILLINOIS.

oatonnarrNe-naorrmn.

Specification of Letters iE'atent.

Patented Sent. 29, 1914.

Application filed September 20, 1911. Serial No. 650,361.

To all whom it may concern Be it known that I, HYMAN ELI GOLDBERG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Calculating-Machines, of which the following is a specification,

'Myinvention is a new totalizer'and particularly a new means for carrying the tens both for addition and subtraction.

The invention is illustrated by the drawings of which- Figure 1 represents an end elevation of a totalizer showing my invention. Fig. 2 is a front elevation of the same with the covers removed, and Fig. 3 shows two carrying wheels and their coiiperating mechanism to more clearly illustrate their construction and operation.

In general the machine is of the same nature as the one shown in Patent No. 893,719 issued to John G. l/Vahl, July 21, 1908, and now on the market under the name, Wahl adding machine. It will therefore be unnecessary to describe it in detail as such de scription can be found in the above cited patent. The totalizer however is completely different from the one there shown and it will therefore be explained in detail.

The totalizer is composed of two side walls 1 which support the adding power lever shaft 2, the subtracting power lever shaft 5, the carrying wheel shaft 4, the idler gear shaft 5, the numeral wheel shaft 6, and the cover 7. These shafts and cover unite the twoside walls and help to supportthe mechanism of the totalizer.

Mounted upon the carrying wheel shaft 1 are the carrying wheels 10, each of which is composed of a 80-toothed gear 11, a 3- lobed adding carrying cam 12 and a 8-lobed subtracting carrying cam 13. The 3G- toothed gear and the two carrying cams are rigidly fastened together. The two carry ing cams are equal but placed to face opposite each other so that one acts in one direction and the other acts in the opposite direction.

hiounted upon the adding power lever shaft 2 are a set of power levers 20, one for each carrying wheel. Each adding power lever has wound around its hub a spring 21 one end of which is fastened to the power lever and the other end of which is fastened to the shaft The power levers 20 are thus given continually a tendency to have their noses 22 brought in toward the carrying wheel shaft 4, but are prevented from doing so by the contact of the noses 22 with the adding carrying cams 12. Upon an examination of Fig. 1, it will be seen that each carrying cam is provided with three in clines 23, and three drops 24, and these inclines and drops cotiperate with the noses 22 of the power levers. Thus any rotation of the carrying wheels in the direction in-- dicated by the arrow in 'Fig. 1 will cause the gradual retraction of the cooperating power lever and the consequent winding up of the springs 21 until the drops 24 pass underneath the noses 22 whereupon the spring 21 immediately moves the power lovers in toward their carrying wheels.

Pivotally mounted upon each power lever upon a'screw is a carrying pawl 31 which is sufficiently off-set to cooperate with the 30-toothed gear 11 of the carryingwheel next to the left. A tension spring 32 has its one end fastened to the carrying pawl 81. and its other out! to the power lever 2. It will thus be seen that the retraction of the power lever and the subsequent return of same caused by the rotation of a carrying wheel will result in the moving forward of the nexthigher carrying wheel one step. So far the mechanism is old and well-known in the art. Besides the above, however, there is present in this totalizer another set of power levers, namely the subtracting power levers 40, mounted upon thepower lever shaft 3. These power levers are absolutely identical in shape with the adding power levers, and are also each provided with a spring 1-1, a nose 12, a screw, 50, and a carrying pawl 51, all of the said parts being similarly shaped to the parts upon the adding power levers. Their operation also is similar, except that the noses 42 of the subtracting power lever cotiperate with the 3- lobed subtracting carrying cams 13. These subtracting carrying cams are also provided with inclines 43 and drops 44E, similarly shaped and for the same purpose as the inclines and drops upon the adding carrying cams.

Of course it is impossible for the machine to add and subtract at the same time and it was therefore necessary to provide mechanism to render only one set of power levers operative on the machine at one time. This one time; and means to render the pawl associated with the inoperative cam inoperative on said higher carrying wheel during the passage of said reversing bar to its al ternative position.

In Witness whereof, I hereunto subscribe my name this 16th day of September, 1911, in the presence of two witnesses.

HYMAN ELI GOLDBERG.

' Witnesses:

W. ELVANS SUMNER, E. W. S'roLziiNBAcH. 

